Character Skeletons, What Do I Do With Them?

So I'm new. Like, really new. To the forums, mind, not roleplay. I've noticed that pretty much every single RP has those tidy little character sheets. My question is... What do I DO with them? I know I need to fill them out, but after that I've no idea. Do I PM the OP? Do I somehow wrangle them to fit in the entirely different Submit Character section?

I do not know this.

Source: http://feedproxy.google.com/~r/RolePlayGateway/~3/DzeuH2bjxK0/viewtopic.php

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